Rudraksha is considered as incarnation of Bhagwan Shiva. The person who wears Rudraksha possess always good health, is respected by all and is capable of attracting everybody & any body.
It is also a kind of shield against negative energies. It is possible for some people to use negative energies to cause harm to someone else. This is a whole science by itself. One Veda, the Atharvana Veda, is all about how to use energies to your advantage and to someone else’s detriment. If somebody who has mastery over this wants to use it, so many things – extreme suffering and even death can be caused.
A rudraksha is a kind of shield against this.